The driver of a bus on which a 14-year-old girl was raped was unaware of the attack, his company has said.

The schoolgirl was attacked on the top deck of the 57 bus as it left Silverburn shopping centre in Pollok, Glasgow, at about 10.30pm last Friday.

She got on the bus with a friend and they took a seat downstairs. The victim went to the upper deck where she got into a conversation with two men who boarded the bus in the city centre. She was then assaulted and raped by both of them.

Her friend, also 14, went up to see her and raised the alarm with passengers downstairs. A woman and two men came to the girls' aid, and they all left the bus two stops along from Silverburn.

The passengers are said to have waited with them until they got another bus home, where police were contacted.

No CCTV footage is available from the bus and Strathclyde Police are appealing for those passengers to come forward to help their investigation.

First Glasgow, the bus operator, said the attack was not reported to the driver and the company is working with police to find the men involved.

A spokesman told BBC Scotland: "Our driver was not aware of the assault. Unfortunately, the incident took place on the top deck of the bus and therefore out of our driver's eyeline and no-one on board approached our driver to report a disturbance.

"The driver ejected the two males in question sometime later in the journey - this was due to separate unruly behaviour. Our thoughts are very much with the victim of the assault."

Both of the attackers are said to be aged around 18 to 20. One is about 5ft 10in, with a shaved head and wearing a black jumper. The other man has brown, spiky hair and was wearing a tracksuit which may have been grey, with a body warmer or jacket.